Greenhouse gases like H2O and CO2 absorb certain wavelengths of longwave radiation emitted from the Earth’s surface. This adds energy to those molecules, which gets transferred to nearby molecules as heat. Without the greenhouse gas molecules, that energy would have been directly transmitted back into space without warming the atmosphere.
Doubling the concentration of atmospheric CO2 from its pre-industrial level, in the absence of other forcings and feedbacks, would likely cause a warming of ~0.3 to 1.1°C, almost 50% of which must already have occurred.
Atmospheric carbon dioxide (CO2) is a mild greenhouse gas that exerts a diminishing warming effect as its concentration increases.
No changes in precipitation patterns, snow, monsoons, or river flows that might be considered harmful to human well-being or plants or wildlife have been observed that could be attributed to rising CO2 levels. What changes have been observed tend to be beneficial.
Over recent geological time, Earth’s temperature has fluctuated naturally between about +4°C and -6°C with respect to twentieth century temperature. A warming of 2°C above today, should it occur, falls within the bounds of natural variability.
Though a future warming of 2°C would cause geographically varied ecological responses, no evidence exists that those changes would be net harmful to the global environment or to human well-being.
At the current level of ~400 ppm we still live in a CO2-starved world. Atmospheric levels 15 times greater existed during the Cambrian Period (about 550 million years ago) without known adverse effects.
The overall warming since about 1860 corresponds to a recovery from the Little Ice Age modulated by natural multidecadal cycles driven by ocean-atmosphere oscillations, or by solar variations at the de Vries (~208 year) and Gleissberg (~80 year) and shorter periodicities.
Earth has not warmed significantly for the past 16 years despite an 8% increase in atmospheric CO2, which represents 34% of all extra CO2 added to the atmosphere since the start of the industrial revolution.
"A 100 years ago or 200 years ago, out of every 10,000 molecules in the atmosphere only 3 out of 10,000 were carbon dioxide Now after 100 or 200 years of carbon dioxide emissions, four out of 10,000 are carbon dioxide. There is very little carbon dioxide in the atmosphere."
If you want green/ leftist corrupted science the NAS is for you.
the onlys time this much co2 was in the air was when there was lotss of vulcanoses, an there aint as meny now as that times. Co2 holdz in the suns heat. Venus has sproof. Thers no conspirtacy cept for the denier movment
Carbon dioxide allows short wavelengths from the Sun to pas, and blocks some of the longer wavelengths from Earth from escaping into space. According to the laws of thermodynamics, this causes Earth to be warmer than it would otherwise be.
global warming is caused by too much carbon dioxide in the atmosphere
start at nasa
climate.nasa.gov
cyclops' references are known deniers
Explain what the greenhouse effect is and how CO2 in the atmosphere is involved. Based on this information, explain how the global warming phenomenon is related to the combustion of fossil fuels.
